CN106593586B - A kind of urea injection apparatus for engine SCR system - Google Patents
A kind of urea injection apparatus for engine SCR system Download PDFInfo
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- CN106593586B CN106593586B CN201611073131.8A CN201611073131A CN106593586B CN 106593586 B CN106593586 B CN 106593586B CN 201611073131 A CN201611073131 A CN 201611073131A CN 106593586 B CN106593586 B CN 106593586B
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- urea
- mixing chamber
- gas circuit
- air passage
- injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/124—Liquid reactants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to a kind of urea injection apparatus for engine SCR system, including urea fluid path, gas circuit, mixing chamber and nozzle, one arrival end of the mixing chamber is connected to gas circuit, another arrival end of the mixing chamber is connected to the urea fluid path, the outlet end of the mixing chamber is connected to the nozzle, air passage one-way valve is provided in the gas circuit, the urea solution road is provided with fluid path check valve, gas in the gas circuit enters the mixing chamber along horizontal flow direction, and the urea liquid in the urea fluid path vertically sprays into the mixing chamber.The present invention effectively solves attached wall crystallisation problems of the urea at air passage one-way valve at urea pump mixing chamber, can reduce complete vehicle fault, improves the stability and reliability of SCR spraying system.The invention further relates to the engine SCR systems including this urea injection apparatus.
Description
Technical field
The invention belongs to motor exhaust after-treatment system technical fields, and in particular to one kind is used for engine SCR system
Urea injection apparatus and engine SCR system including this urea injection apparatus.
Background technique
SCR catalytic reduction technique is to reduce Diesel NOx discharge, meets the important technology road of state IV and the above emission regulation
Line.SCR system basic functional principle is that exhaust enters in exhaust pipe after booster turbine outflow, while by being mounted on exhaust
Urea injection unit on pipe sprays into quantitative aqueous solution of urea in exhaust pipe with mist form, and urea droplets are in high-temp waste gas
Effect issues unboiled water solution and pyrolytic reaction, and reducing agent ammonia required for generating, ammonia is under the effect of the catalyst by nitrogen oxidation
Object is selectively reduced to nitrogen.Spraying system as the kernel component in SCR system, the injection of spraying system it is reliable
Property and stability directly influence the transfer efficiency of SCR system.Due to using urea in SCR system, and urea is easy
Existing crystalline polamer, especially in urea liquid and gas mixing, urea can crystallize at gas circuit and fluid path mixing, cause to urinate
The air passage one-way valve Crystallization Plugging of plain spraying system and the vehicle trouble caused, and then discharge is caused to severely exceed and SCR case knot
Crystalline substance, and cause vehicle limit and turn round to influence the normal use of user.
Summary of the invention
In order to effectively solve attached wall crystallisation problems of the urea at air passage one-way valve at urea pump mixing chamber, the present invention is proposed
A kind of urea injection apparatus for engine SCR system can reduce complete vehicle fault, improve the stability of SCR spraying system
And reliability.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of urea injection apparatus for engine SCR system, including urea fluid path, gas circuit, mixing chamber and nozzle, institute
An arrival end for stating mixing chamber is connected to gas circuit, another arrival end of the mixing chamber is connected to the urea fluid path, institute
The outlet end for stating mixing chamber is connected to the nozzle, and air passage one-way valve is provided in the gas circuit, and the urea solution road is arranged
There is fluid path check valve, the gas in the gas circuit enters the mixing chamber along horizontal flow direction, and the urea in the urea fluid path is molten
Liquid vertically sprays into the mixing chamber.
Further, the mixing chamber is spiral-flow type mixing chamber, and gas and urea liquid tangentially enter the mixing chamber, is formed
Rotating vortex sprays.
Further, the inner wall of the mixing chamber is equipped with spiral groove or deflector is arranged in the shape of a spiral on inner wall.
Further, the air passage one-way valve is mounted in the gas circuit by air passage one-way valve mounting seat, the gas circuit
Check valve and the inner wall of the air passage one-way valve mounting seat are tightly connected.
Further, the cross sectional shape of the outlet side of the air passage one-way valve mounting seat is taper.
Further, the air passage one-way valve includes valve body, piston and spring, and the spring setting is in the valve body and described
Between piston, the piston is connect by sealing ring with the valve seal.
Further, it is provided in the gas circuit between the air passage one-way valve and the mixing chamber for making stable gas pressure exist
The pressure limiting valve of predetermined value and cushion chamber for avoiding the air passage one-way valve from directly contacting with urea liquid.
Further, the gas circuit and the urea fluid path are mutually perpendicular to.
Another object of the present invention is to propose a kind of engine SCR system, and the engine SCR system includes described above
Urea injection apparatus.
The present invention has the advantages that
(1) horizontal using gas flow, the mode that urea liquid vertically sprays into can avoid air passage one-way valve and directly contact urine
It is broken thinner can also to go up urea droplets for plain solution.
(2) increase cushion chamber between air passage one-way valve and mixing chamber, increase check valve to the distance of mixer, make it
It is away as far as possible urea liquid, check valve is avoided directly to contact with urea liquid.
(3) the cross sectional shape design of air passage one-way valve mounting seat structure outlet side is tapered, avoids the dead of urea liquid
Angle residual.
(4) pressure limiting valve is set between air passage one-way valve and mixing chamber, the stable gas pressure in gas circuit can be made in certain value.
(5) mixing chamber is designed to spiral-flow type, so that gas and urea liquid are sufficiently mixed, and are sprayed in rotating vortex shape is formed
Out, the stability of injection is improved.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 shows the urea injection apparatus schematic diagram of embodiment according to the present invention；
Fig. 2 shows the air passage one-way valve mounting seat structural schematic diagrams of embodiment according to the present invention.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened is fully disclosed to those skilled in the art.
Embodiment according to the present invention, as shown in Figure 1, proposing a kind of urea injection dress for engine SCR system
Set, including urea fluid path, gas circuit, mixing chamber and nozzle, one end of the mixing chamber is connected to gas circuit, the mixing chamber it is another
End be connected to nozzle, another arrival end of the mixing chamber is connected to the urea fluid path, the outlet end of the mixing chamber and
The nozzle is connected to, and air passage one-way valve is provided in the gas circuit, the urea solution road is provided with fluid path check valve, described
The pressure limiting valve and use for making stable gas pressure in predetermined value are provided in gas circuit between air passage one-way valve and the mixing chamber
In the cushion chamber for avoiding the air passage one-way valve from directly contacting with urea liquid.Air compressor machine or vehicle gas cylinder are urea injection apparatus
There is provided pressure stable gas source, gas enters gas circuit by air passage one-way valve and makes stable gas pressure certain by pressure limiting valve
Value, urea liquid, which reaches, to be entered mixing chamber by the check valve of urea solution road after certain pressure and is mixed with compressed air.
Gas circuit to increasing cushion chamber between valve and mixing chamber, thus increase air passage one-way valve to mixing chamber distance so that check valve is most
Possibly remote from urea liquid, check valve is avoided directly to contact with urea liquid.
The gas circuit and urea fluid path are mutually perpendicular to, and the gas in the gas circuit enters mixing chamber along horizontal flow direction, described
Urea liquid in urea fluid path vertically sprays into mixing chamber, thus increase into mixing chamber gas and urea liquid it is opposite
Speed difference, so that urea droplets are broken thinner.Due to horizontal using gas flow, the mode that urea liquid vertically sprays into can be kept away
Exempt from air passage one-way valve and directly contacts urea liquid.
The mixing chamber is spiral-flow type, and inner wall is equipped with spiral groove or deflector, gas is arranged in the shape of a spiral on inner wall
Body and urea liquid tangentially enter mixing chamber, form rotating vortex and spray, improve the stability of injection.
The present invention also improves air passage one-way valve mounting seat structure, as shown in Fig. 2, check valve is unidirectional by gas circuit
Valve mounting seat 1 is mounted in gas circuit, and the inner wall of the air passage one-way valve and the air passage one-way valve mounting seat 1, which seals, to be connected
Connect, the air passage one-way valve includes valve body 2, piston 3 and spring 4, the setting of spring 4 the valve body 2 and the piston 3 it
Between, the piston 3 is tightly connected by sealing ring 5 and valve body 2, the section shape of 1 outlet side of air passage one-way valve mounting seat
Shape is taper, and the dead angle of urea liquid is avoided to remain.
The present invention also proposes that a kind of engine SCR system, the engine SCR system include urea injection dress described above
It sets.
For the present invention by improving gas circuit structure, gas flow is horizontal, and the mode that urea liquid vertically sprays into is not influencing most
It allows air passage one-way valve to avoid contact with gas-liquid mixture under the premise of whole atomizing effect, it is unidirectional can effectively to solve gas circuit existing for market
Valve crystallisation problems, enhancing post-processing kernel component and automobile reliability.Avoiding system once quotes air passage one-way valve simultaneously
Blocking dependent failure is with regard to blindly removing processing or replacing the waste of the unnecessary man power and material of urea pump bring.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention answers the protection model with claim
Subject to enclosing.
Claims (9)
1. a kind of urea injection apparatus for engine SCR system, including urea fluid path, gas circuit, mixing chamber and nozzle, special
Sign is: an arrival end of the mixing chamber is connected to gas circuit, another arrival end and the urea solution of the mixing chamber
Road connection, the outlet end of the mixing chamber are connected to the nozzle, air passage one-way valve are provided in the gas circuit, in the gas circuit
It is provided in gas circuit between check valve and the mixing chamber for avoiding the air passage one-way valve from directly contacting with urea liquid
Cushion chamber, urea solution road is provided with fluid path check valve, and the gas in the gas circuit enters described mixed along horizontal flow direction
Chamber is closed, the urea liquid in the urea fluid path vertically sprays into the mixing chamber.
2. urea injection apparatus according to claim 1, which is characterized in that the mixing chamber is spiral-flow type mixing chamber, gas
Body and urea liquid tangentially enter the mixing chamber, form rotating vortex and spray.
3. urea injection apparatus according to claim 2, which is characterized in that the inner wall of the mixing chamber is equipped with spiral groove
Or deflector is set in the shape of a spiral on inner wall.
4. urea injection apparatus according to claim 1 or 2 or 3, which is characterized in that the air passage one-way valve passes through gas circuit
Check valve mounting seat is mounted in the gas circuit, and the air passage one-way valve and the inner wall of the air passage one-way valve mounting seat are close
Envelope connection.
5. urea injection apparatus according to claim 4, which is characterized in that the outlet of the air passage one-way valve mounting seat
The cross sectional shape at end is taper.
6. urea injection apparatus according to claim 5, which is characterized in that the air passage one-way valve includes valve body, piston
And spring, the spring are arranged between the valve body and the piston, the piston passes through sealing ring and the valve seal
Connection.
7. urea injection apparatus according to claim 1 or 2, which is characterized in that mixed in the air passage one-way valve with described
Close the pressure limiting valve being provided in the gas circuit between chamber for making stable gas pressure in predetermined value.
8. urea injection apparatus according to claim 1 or 2, which is characterized in that the gas circuit and the urea fluid path phase
It is mutually vertical.
9. a kind of engine SCR system, the engine SCR system includes according to claim 1 to described in any one of 8
Urea injection apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073131.8A CN106593586B (en) | 2016-11-29 | 2016-11-29 | A kind of urea injection apparatus for engine SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073131.8A CN106593586B (en) | 2016-11-29 | 2016-11-29 | A kind of urea injection apparatus for engine SCR system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106593586A CN106593586A (en) | 2017-04-26 |
| CN106593586B true CN106593586B (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611073131.8A Active CN106593586B (en) | 2016-11-29 | 2016-11-29 | A kind of urea injection apparatus for engine SCR system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107456882B (en) * | 2017-09-14 | 2021-01-08 | 无锡威孚力达催化净化器有限责任公司 | Urea solution metering pump gas-liquid mixing device |
| CN108119222A (en) * | 2017-12-21 | 2018-06-05 | 重庆麦纳昇科技有限公司 | A kind of exhaust pipe |
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| CN101660442A (en) * | 2008-05-28 | 2010-03-03 | 中国第一汽车集团公司 | Vehicle-mounted SCR metering and ejecting system taking NOx in exhaust gas as variable |
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| CN105545423A (en) * | 2016-02-05 | 2016-05-04 | 东风商用车有限公司 | Urea jet system without air-assisted atomization and control method of atomized urea jet system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106593586A (en) | 2017-04-26 |
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